The motion of 180° domain walls in uniform dc magnetic fields

Abstract

The equations of motion of a 180° domain wall in an infinite uniaxially anisotropic medium which is exposed to an instantaneously applied uniform dc magnetic fieldH 0 have been integrated numerically. Below the critical fieldHc =2παM 0 (α is the Gilbert loss parameter and M 0 the saturation magnetization), where a steady‐state solution is known to exist, it is shown that the wall motion tends smoothly to this solution. Above Hc , the magnetization precesses about the field and a periodic component appears in the forward motion of the wall. Analytic solutions for the wall motion have been found based upon approximations suggested by the computed behavior; these reproduce the computer results very accurately.